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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk>
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pulsecore/random.h>
#include <pulsecore/macro.h>
#include <pulsecore/endianmacros.h>
#include "cpu-arm.h"
#include "sample-util.h"
#if defined (__arm__) && defined (HAVE_ARMV6)
#define MOD_INC() \
" subs r0, r6, %2 \n\t" \
" itt cs \n\t" \
" addcs r0, %1 \n\t" \
" movcs r6, r0 \n\t"
static pa_do_volume_func_t _volume_ref;
static void pa_volume_s16ne_arm(int16_t *samples, const int32_t *volumes, unsigned channels, unsigned length) {
/* Channels must be at least 4, and always a multiple of the original number.
* This is also the max amount we overread the volume array, which should
* have enough padding. */
const int32_t *ve = volumes + (channels == 3 ? 6 : PA_MAX (4U, channels));
unsigned rem = PA_ALIGN((size_t) samples) - (size_t) samples;
/* Make sure we're word-aligned, else performance _really_ sucks */
if (rem) {
_volume_ref(samples, volumes, channels, rem < length ? rem : length);
if (rem < length) {
length -= rem;
samples += rem / sizeof(*samples);
} else
return; /* we're done */
}
__asm__ __volatile__ (
" mov r6, %4 \n\t" /* r6 = volumes + rem */
" mov %3, %3, LSR #1 \n\t" /* length /= sizeof (int16_t) */
" cmp %3, #4 \n\t" /* check for 4+ samples */
" blt 2f \n\t"
/* See final case for how the multiplication works */
"1: \n\t"
" ldrd r2, [r6], #8 \n\t" /* 4 samples at a time */
" ldrd r4, [r6], #8 \n\t"
" ldrd r0, [%0] \n\t"
#ifdef WORDS_BIGENDIAN
" smulwt r2, r2, r0 \n\t"
" smulwb r3, r3, r0 \n\t"
" smulwt r4, r4, r1 \n\t"
" smulwb r5, r5, r1 \n\t"
#else
" smulwb r2, r2, r0 \n\t"
" smulwt r3, r3, r0 \n\t"
" smulwb r4, r4, r1 \n\t"
" smulwt r5, r5, r1 \n\t"
#endif
" ssat r2, #16, r2 \n\t"
" ssat r3, #16, r3 \n\t"
" ssat r4, #16, r4 \n\t"
" ssat r5, #16, r5 \n\t"
#ifdef WORDS_BIGENDIAN
" pkhbt r0, r3, r2, LSL #16 \n\t"
" pkhbt r1, r5, r4, LSL #16 \n\t"
#else
" pkhbt r0, r2, r3, LSL #16 \n\t"
" pkhbt r1, r4, r5, LSL #16 \n\t"
#endif
" strd r0, [%0], #8 \n\t"
MOD_INC()
" subs %3, %3, #4 \n\t"
" cmp %3, #4 \n\t"
" bge 1b \n\t"
"2: \n\t"
" cmp %3, #2 \n\t"
" blt 3f \n\t"
" ldrd r2, [r6], #8 \n\t" /* 2 samples at a time */
" ldr r0, [%0] \n\t"
#ifdef WORDS_BIGENDIAN
" smulwt r2, r2, r0 \n\t"
" smulwb r3, r3, r0 \n\t"
#else
" smulwb r2, r2, r0 \n\t"
" smulwt r3, r3, r0 \n\t"
#endif
" ssat r2, #16, r2 \n\t"
" ssat r3, #16, r3 \n\t"
#ifdef WORDS_BIGENDIAN
" pkhbt r0, r3, r2, LSL #16 \n\t"
#else
" pkhbt r0, r2, r3, LSL #16 \n\t"
#endif
" str r0, [%0], #4 \n\t"
MOD_INC()
" subs %3, %3, #2 \n\t"
"3: \n\t" /* check for odd # of samples */
" cmp %3, #1 \n\t"
" bne 4f \n\t"
" ldr r0, [r6], #4 \n\t" /* r0 = volume */
" ldrh r2, [%0] \n\t" /* r2 = sample */
" smulwb r0, r0, r2 \n\t" /* r0 = (r0 * r2) >> 16 */
" ssat r0, #16, r0 \n\t" /* r0 = PA_CLAMP(r0, 0x7FFF) */
" strh r0, [%0], #2 \n\t" /* sample = r0 */
"4: \n\t"
: "+r" (samples), "+r" (volumes), "+r" (ve), "+r" (length)
: "r" (volumes + ((rem / sizeof(*samples)) % channels))
: "r6", "r5", "r4", "r3", "r2", "r1", "r0", "cc"
);
}
#endif /* defined (__arm__) && defined (HAVE_ARMV6) */
void pa_volume_func_init_arm(pa_cpu_arm_flag_t flags) {
#if defined (__arm__) && defined (HAVE_ARMV6)
pa_log_info("Initialising ARM optimized volume functions.");
if (!_volume_ref)
_volume_ref = pa_get_volume_func(PA_SAMPLE_S16NE);
pa_set_volume_func(PA_SAMPLE_S16NE, (pa_do_volume_func_t) pa_volume_s16ne_arm);
#endif /* defined (__arm__) && defined (HAVE_ARMV6) */
}
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